How I built a rhythm racing game with Claude Opus 5.5, six skills, and a voice feedback loop
Groowl · reddit · 2026-11-07
Developer Groowl shares the full workflow behind Neo Sigilum, a racing game (30 tracks) where you speed up by staying in rhythm with the music, built with Claude Opus 5.5 in Claude Code.
Skills used: chirp-game-audio (all music, written in code and rendered at every tempo so songs speed up with gameplay), kiln-3d-assets (3D models: ships, rockets, monuments), loom-textures (materials), montage-video (trailer/shorts cut on the beat with HyperFrames), tiktok-script-writer, and humanizer for copy.
Two non-skill tricks that helped a lot: a "human" test bot that only sees the screen, has reaction latency, and reports which obstacles appear too late; and a voice feedback mode—talk while playing, hit F10, and Claude receives the Whisper transcription plus screenshot and clip before changing anything.
Free browser demo: groowl.itch.io/neo-sigilum-demo
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